1.Evenness and precision of control. 2.The gases can be hydrogen, ammonia or air. The blue tungsten oxide furnace, also called turning tube furnace, is a must device in the powder metallurgy industry (especially the metallurgy of tungsten and molybdenum), whose main use is to turn the semifinished product apt (ammonium paratungstate) into blue tungsten oxide and molybdenum through the proper control of temperature, time, inside atmosphere and pressure in furnace. The pif-regulated control system, for the temperature control, consists of the thermal coupler, temperature controller and controllable silicon trigger and features its evenness and precision of control. The staying time of furnace materials can be set by changing the rotation speed and slant of the furnace tube on the basis of the process requirements. The gases in the furnace chamber can be customized as hydrogen, ammonia or air.